Motor and control therefor



Oct. 8, 1940. A. RAPPL' IOTOR AND CONTROL THEREFOR Filed April l, 1939 2Sheets-Sheet 1 2 MP vN R \\\\\IIII o m hu\ Q V h 0 Y 1 AH QB D u I A WMT 00 FiQi.

0, 8,1949. A. RAPPL 2,217,382

IO'I OR AND common THEREFOR Filed April l, 1939 I 2 shoats-sheatwfiINVENTOR -w aamgwv ATT NEYS Patented Oct. 8, 194i) Q UNITED STATESPATENT OFFICE MOTOR AND CONTROL THEREFOR Anton Rappl, Buffalo, N. Y.,assignor to Trico Products Corporation, Buffalo, N. Y.

Application April 1, 1939, Serial No. 265,467 9 Claims. (Cl. 121-97) Thepresent invention relates to fluid motors right chamber B. Casing coverl2 may be proand control means therefor and has particular vided with avalve seat l5 having a suction port relation to' a motor, such as awindshield cleaner l6 and right and left atmospheric ports I! and motor,having parking means, and to a control for IR respectively, port llopening through a passage 5 the motor and parking means which may be l9into right chamber'B, and port l8 opening 5 remote therefrom. Inwindshield cleaner motors through passages 2i and 22, which communicateoperated by suction, and also in those operated through a chamber 23into left chamber A. by greater-than-atmospheric pressure, a piston Avalve 24 movable in an arcuate path upon is oscillated by thealternateapplication of difvalve seat I5 has its inner face recessed so that 10ierential pressures to opposing faces thereof, when in the positionshown it will. cover and consuch alternate application being effected byan nect ports 16 and I8, leaving port I! open to the automatic valvemechanism which reverses the atmosphere, but when moved to the right,will outlet and inlet ,ports automatically upon the cover and connectports l6 and I1, leaving port piston approaching its limit position atthe end l8 open to the atmosphere. Valve 24 may be 15 of each operatingstroke. To effect parking, or operated automatically in accordance withmovestopping and holding the piston in one limit poment of piston l3, byany suitable mechanism sition, it is necessary to apply the differential(not shown herein) such, for example, as the pressures in apredetermined manner, audit is mechanism disclosed in Patent No.1,978,634 ishighly desirable to provide means whereby such sued October30, 1934, to Henry Hueb-er. All

20 application is made regardless of the position of thatis essential isthat the valve 24 move to cover 20 the automatic valve mechanism inorder that ports l6 and H when the piston I 3 reaches its parking willcertainly result upon operation of a limit operating position to theleft so that a sucparking control valve whether the piston is movtionconnection to port l6 will serve to withdraw ing'in one direction or theother at the time the air from chamber B, and uncover port I8 to ad- 25control valve is operated. mit air to chamber-A, thereby causing thepis- 25 By the present invention an improved appaton to be moved to theright; and when piston ratus is provided for effecting this result. InI3 reaches its limit operating position to the such apparatus thecontrol valve may be, if d right, the valve 24 moves to cover ports l6and sired, remote from the motor, and may be conl8 and uncover port ll,admitting air to chamber nected therewith by only two fluid conduits. Band connecting chamber A to a suction connec- For example, the motor maybe mounted at the tion, causing the piston to be moved to the left.

upper edge of the windshield of a vehicle, or ad- Formed in the casingcover I2 is a suction pasjacent a rear window, and the control upon thesage 25 opening into a cylinder 26, the other end instrument panel. ofpassage 25 being connected to a conduit 21 These and other objects andadvantages will extending to a pa ve u t 8. Within become apparent fromthe following description cylinder 26, the outer end of which is closedby of the typical embodiment of the invention illusa cover 35 having anatmospheric vent 36, is a trated in the accompanying drawings wherein: ps 35 v g a piston rod 32 extending into Fig. 1 is a plan view of themotor; chamber 23. In the latter is disposed a ball Fig. 2 is afragmentary plan sectional view,- valve 33 adapted to close against avalve seat 34, 40

the plane of this section being through the cover thereby closing fluidcommunication between pasof the motor casing; sages 2| and 22, or toclose against a valve seat Fig. 3 is a fragmentary vertical sectionalview 37-f0rmed O a tubular member 33 that a ptak along 1in 3 3 of Fig,1; ple 39 for connection to' a parking suction con- Fig. 4 is anelevational view of a fragment of duit 4|. 45 the mot r casing ov r; Aspring 42 is disposed in member 38 for hold- Fig.5 is a fragmentaryvertical sectional view ing ball valve 33 upon valve seat 34, but whentaken along line 5-5 of Fig, 1; and suction is applied, via passage 25,to cylinder 26,

Fig. 6 is a schematic view showing the essenthe piston 3| is moved tothe left (in Figs, 2, 3 tial parts of the motor and control apparatus.and 5) with the result that rod-32 presses the ball 50 As shown in thelatter view the motor includes valve upon seat 31 against thecompression of a casing II with cover l2, and a vane type piston spring42. 7 i3 movable in the casing in an arcuate path about The controlvalve 28 may be of any suitable the axis of a rock shaft I4, the pistondividing construction for connecting conduit 21 to a source the casinginterior into a left chamber A and a of suction to effect operation andventing it to the atmosphere to veflect parking. As shown in Fig. 6 itmay include a valve seating member 42 having 'a. port 44 communicatingwith conduit 21 anda-port 45 communicating with a conduit 46 leading tothe suction source.

,.a recess 48 for connecting ports 44 and 45 in one position of thevalve (that shown in Fig. 6) and an atmospheric .vent 49 forregistration with port 44 when valve 41 is moved to the left from theposition shown. The valve may be manually moved to either of thesetwo-positions, the unit 28 being capable of being mounted inany suitableposition relative to the motor.

Suction parking conduit 4| may extend to any suitable source of suction;if so desired, it may be connected, as indicated at 'to suction conduit46,

when the control valve 41 is in the position shown in Fig. 6, the motoroperates-in the manner hereinbefore described, air being withdrawntherefrom via port I6, opening 29, passage 25, conduit 21, ports 44 and45, and conduit 46 to the source of suction. Piston 3l-is drawn furtherinto cylinder 26 so that the ball valve 33 is held on seat 31, closingconduit 4| from chamber 23,'and away from seat 34 so that conduits 2|and 22 are in open communication through chamber 23.

When the control valve 41 is in the parking position wherein ports 44and 49 are in registry, and port'45 is closed, air is vented throughconduit 21 and passage 25 into cylinder chamber 26 'so that spring 43maymove ball valve 33, rod 32 and piston 3| to the right (in Figs. 2, 3 and5) until the ball valve closes against seat 34. is withdrawn fromchamber A through passage 22, chamber 23, tubularmembers 38 and 39, andconduit 4| to the source of suction, thereby partially evacuatingchamber A with the-result that piston l3 will be moved to and held inits maximum position to the left (in Fig. 6) by atmospheric pressure inchamber B. The latter chamber, in the parking position of, the controlvalve 41, will always be subjected to atmospheric pressure, regardlessof the position of automatic valve 24. If valve 24 is in theposition'shown in Fig. 6, air from the atmosphere will enter chamber Bdirectly through port, l1 and passage I9. If the valve 24 be in aposition covering ports l6 and I1, atmospheric air will enter thechamber via port 44, conduit 21, and passage 25 to port l6, and thencethrough valve 24 to port l1 and passage l9.

It will be understood that the devices herein described and illustratedare merely-illustrative of the inventive principles and combinationsinvolved, and that the same may be incorporated in other embodiments,without departing from the spirit of the invention or the scope of theappended claims. For example, while the invention has been shown anddescribed as applied to a motor in which one of thedififerentialoperating pressures is .suction or less-than-atmosphericpressure, it will be understood that the invensure and suction to'opposite sides of the motor chamber, and parking means comprising meansfor venting the suction connection of the valve means to the atmosphere,and pressure responsive means operable upon said venting forinterrupting fluid communication between the valve A control valve 41"slidable on the valve seating member 43 has- Air means andone side-oi?the motor chamber and for applying suction to said one side of'the motorchamber.

2. In a windshield cleaner motor and control therefor associated witha/source of suction, a conduit normally connected to the source, a motorchamber having ports at the opposite sides thereof, automatic valvemeans for alernately connectingsaid conduit and the atmosphere to saidports, and parking means comprising a control valve for closing saidconduit from the source and permitting an increase of pressure in theconduit, and means responsive to said lncreaQ of pressure for closingone of said ports from the automatic valve means and opening it to asource of suction..

3. In combination with a fluid pressure motor having automatic valvemeans for alternately applying difierential pressures to opposite sidesof the motor chamber, parking means for applying fluid pressure to. oneside of the mptor chamber and simultaneously disrupting fluidcommunication between said one side of the motor chamber and theautomatic valve means, fluid .pressure means for operating said parkingmeans, and valve means remote from the motor for controlling said fluidpressure means.

4. In a fluid pressure motor, a motor chamber having a port andautomatic valve means .for alduit and a valve for selectively connectingsaid port to either the parking conduit or the automatic valve means,and fluid pressure means for operating said valve.

5. In a fluid pressure motor, a motor chamber having a port andautomaticvalve means for alternately applying atmospheric and adifferent operating pressure to said port, a parking conduit,-a valvemovable to a position for connecting said port to the parking conduit orto a position for connecting said port to the automatic valve means,spring means normally urging the valve to one of said positions andfluid operated means for moving the valve to the other position againstthe resistance of said spring.

6. In a fluid pressure motor and control therefor, a motor chamber andautomatic valve means for alternately applying atmospheric pressure andan operating pressure different from atmospheric to opposite sides ofthe motor chamber, and parking means comprising valve means forconnecting to the atmosphere the operating pressure connection of thevalve means, and pressure responsive means effective upon saidconnecting to the atmosphere for interrupting fluid communicationbetween the automatic valve means and one side-of the motor chamber andfor applying to the latter an operating pressure.

'7, In a fluid pressure motor and control therefor associated with asource ofpressure different from atmospheric pressure, a conduitconnected to said source for operation of the motor, a motor chamberhaving ports at the opposite sides there of, automatic valve means foralternately connecting said conduit and the atmosphere to said ports,and parking means comprising a control valve for closing said conduitfrom the source and permitting the pressure in the conduit to approachatmospheric pressure, and means responsive to the foregoing change ofpressure for closing one of said ports from the automatic valve meansand opening it to said source.

8. In a windshield cleaner motor and control therefor associated with asource of suction, a motor chamber having ports at the opposite sidesthereof, an operating conduit connectible to said source, automaticvalve means on the motor for alternately connecting said ports to saidconduit and to the atmosphere, and parking means comprising a parkingconduit connectible to a source of suction and communicating with onemotor chamber port, a valve and spring means for normally causing thevalve to close said motor chamber port from the automatic valve means.suction operated means connected with the operating conduit for causingthe valve to close said motor chamber port from the parking conduitagainst the resistance of said spring, and valve means for connecting ordisconnecting the operating conduit from the source of suction torespectively effect operation or parking of said motor.

9. In a windshield cleaner motor and control therefor, a conduitextending from a source of operating pressure to the motor, a secondconduit extending from a source of pressure to the motor for providingpressure for parking the motor, valve means in the first conduit forconnecting or disconnecting the latter from the source, and fluidoperated means adjacent the motor responsive to disconnection of thefirst conduit from the source to operatively connect the motor to theparking conduit to effect parking of the motor.

ANTON RAPPL.

